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In three Major League seasons since his debut in 2014, Frias went 6-6 with a 4.50 ERA in 33 games, 15 of them starts. He struck out 75 batters in 114 innings.
The 27-year-old was limited to just one big league appearance for Los Angeles in 2016, as well as 10 Minor League outings, due to a right oblique injury. Friar threw four scoreless innings in relief for the Dodgers against the Padres on July 7.
Before Monday's trade, Los Angeles had designated Frias for assignment on Jan. 25 to clear space on the 40-man roster.
David Adler is a reporter for MLB.com based in New York. Follow him on Twitter at @_dadler. This story was not subject to the approval of Major League Baseball or its clubs.